MILLICOM LAUNCHES GSM SERVICES IN CENTRAL AMERICA

MILLICOM LAUNCHES GSM SERVICES IN CENTRAL AMERICA New York, Stockholm, London and Luxembourg - August 20, 2004 - Millicom International Cellular S.A. ("Millicom") (Nasdaq Stock Market: MICC, Stockholmsbörsen: MIC), today announces that its operations in Guatemala, El Salvador and Honduras have launched GSM services in the 850 MHz frequency, under the brand name of Tigo. The service will cover 92% of the population of El Salvador and 75% of the populations of Guatemala and Honduras. Customers will benefit from service enhancements including innovative wireless internet browser (WIB) services through the Tigo Menu. Comcel in Guatemala and Telemovil in El Salvador will continue to operate their TDMA cellular services alongside the GSM offering and, in Honduras, Celtel will continue to operate its CDMA service. Marc Beuls, President and CEO of Millicom International Cellular commented: "Central America is our largest cluster in terms of revenue and we expect the launch of GSM services to create added momentum in terms of both customer intake and revenue growth. We are committed to providing our customers with the most advanced technology, the best services and the widest regional coverage at the lowest tariffs, which will enable us to grow our market share." Millicom International Cellular S.A. is a global telecommunications investor with cellular operations in Asia, Latin America and Africa. It currently has a total of 16 cellular operations and licenses in 15 countries. The Group's cellular operations have a combined population under license of approximately 387 million people. This press release may contain certain "forward-looking statements" with respect to Millicom's expectations and plans, strategy, management's objectives, future performance, costs, revenues, earnings and other trend information. It is important to note that Millicom's actual results in the future could differ materially from those anticipated in forward-looking statements depending on various important factors. Please refer to the documents that Millicom has filed with the U.S. Securities and Exchange Commission under the U.S. Securities Exchange Act of 1934, as amended, including Millicom's most recent annual report on Form 20-F, for a discussion of certain of these factors. All forward-looking statements in this press release are based on information available to Millicom on the date hereof. All written or oral forward-looking statements attributable to Millicom International Cellular S.A., any Millicom International Cellular S.A members or persons acting on Millicom's behalf are expressly qualified in their entirety by the factors referred to above. Millicom does not intend to update these forward-looking statements. CONTACTS: Marc Beuls President and Chief Executive Officer Millicom International Cellular S.A., Luxembourg Telephone: +352 27 759 327 Andrew Best Investor Relations Telephone: +44 20 7321 5022 ------------------------------------------------------------ This information was brought to you by Waymaker http://www.waymaker.net The following files are available for download: http://www.waymaker.net/bitonline/2004/08/20/20040819BIT21800/wkr0001.pdf